Database Develop

No-one one here experienced the 3G bug then?

This is a problem where you have an apparently good 3G signal BUT you cannot make or receive calls or texts and you can't establish a data connection. There is no obvious sign that you are in this state until you try to call, text or access data.
The "solution" from T-Mobile in the UK is to force the phone "band" setting from Auto to GSM, then it works. But of course its not a solution as you lose 3G.
If you are at work with a 3 icon on your phone, just try calling it from your desk and see if you get straight to voicemail or not.
After discussions with T-Mobile they are sending me a replacement handset but if the postings in Modaco are anything to go by then I am not alone in this.
What is not clear is whether this is restricted to:
1. The T-Mobile UK network
2. The T-Mobile UK Vario III firmware
3. A combination of the above
4. A general design fault with some Kaiser's
This is being discussed in the Modaco forums but I couldn't find any mention here.

I make dozens of calls, and send around 50+ SMS a day.
No problems in the last month.
I am an Australian Kaiser owner running on the Three network.
ROM: 1.81.861.0 WWE

Hi there,
I have the same issue on T-Mobile in Germany.
What I have not been able to figure out is if the phone works again after a while or if one needs to reset (as I always do).
Regards,
Martin

I have tried soft resets and even a hard reset and it appears to be random whether it starts working again. This seems to be same experience as the Modaco users.
thinksmart said:
Hi there,
I have the same issue on T-Mobile in Germany.
What I have not been able to figure out is if the phone works again after a while or if one needs to reset (as I always do).
Regards,
Martin
Click to expand...
Click to collapse

mbriody said:
This is a problem where you have an apparently good 3G signal BUT you cannot make or receive calls or texts and you can't establish a data connection. There is no obvious sign that you are in this state until you try to call, text or access data.
What is not clear is whether this is restricted to:
1. The T-Mobile UK network
2. The T-Mobile UK Vario III firmware
3. A combination of the above
4. A general design fault with some Kaiser's
Click to expand...
Click to collapse
Well, I worked for T-Mobile UK recently and had the very same issue on my Vario II, even whilst at work where there was a large mast and the 3G coverage was the strongest in the country.
on further investigation, everyone else in the area had the same issue. sometimes it would work ok, a lot of the time i had to manually set to 2G just to be able to use the phone functions.
in T-Mob we could check the strength of various 2 & 3G signals by postcode, and the signal in the area was very strong, with no outstanding work issues or problems (according to our system)
was never able to figure out why this was happening, and nobody was able to answer the questions.
so -
seems to be T-Mob UK (perhaps just in various areas at various times), and is not limited to your Kaiser / Vario, so at least you can relax cos it's not a faulty phone

Thanks for the very useful post. Unfortunately that doesn't give us a solution. If this cannot be fixed then T-Mobile is useless for me.
Dr J said:
was never able to figure out why this was happening, and nobody was able to answer the questions.
so -
seems to be T-Mob UK (perhaps just in various areas at various times), and is not limited to your Kaiser / Vario, so at least you can relax cos it's not a faulty phone
Click to expand...
Click to collapse

i've been experiencing the same - no data access when using 3g (whilst showing 2 bars) but connecting fine using gsm.
can anyone point me in the direction of a replacement comm manager with the same icons as the default kaiser but with a 3g switch in the vacant slot ?
i've been looking at a few replacement comm managers but can't seem to find what i'm looking for ...

This is NOT a problem with your Kaiser, replacing your phone will not make a difference. It is problem with your provider's tower hard/software. Strange that T-Mobile has not told you this when you contacted them about it.
T-Mobile in the Netherlands does not have this problem, but the KPN network does. KPN is however in the process of replacing the faulty hardware (or maybe they are already done now, even) and suddenly the problem disappears

Found the solution!!
Hello,
I had the same problem untill one day I inserted my sim card in another phone (a very old nokia - as basic as it gets).
For some reason that I don't know, when I put the sim card back in the TyTN II it was working and keeps on working.
This has happened over a month ago, and I now don't hv a problem.
Try to do the same, see if it works for You
Regards
XTP

Nope, I already tried the SIM in another phone (an SE W880i) and it was okay. I put it back in the Vario III and it still didn't work.
I also tried soft and hard resets.
xtp73 said:
Hello,
I had the same problem untill one day I inserted my sim card in another phone (a very old nokia - as basic as it gets).
For some reason that I don't know, when I put the sim card back in the TyTN II it was working and keeps on working.
This has happened over a month ago, and I now don't hv a problem.
Try to do the same, see if it works for You
Regards
XTP
Click to expand...
Click to collapse

i can confirm that this didn't work for me either. :-(
worth a try though ...

I had this with a Hermes on Orange UK a year ago. They admitted that the local cell was faulty and was being fixed and asked me to go to GSM for a week. After a week I switched back and it was fine.
Am now using a Kaiser (O Tytn2) in same location and its fine.

well i know ive been having problems sending mms whenever im on the 3g network, but as soon as i switch to gsm then the mms sends fine!

Chainfire said:
This is NOT a problem with your Kaiser, replacing your phone will not make a difference. It is problem with your provider's tower hard/software. Strange that T-Mobile has not told you this when you contacted them about it.
T-Mobile in the Netherlands does not have this problem, but the KPN network does. KPN is however in the process of replacing the faulty hardware (or maybe they are already done now, even) and suddenly the problem disappears
Click to expand...
Click to collapse
This is correct, the problem is indeed not your Tytn II. I've called with a dutch provider (Telfort) which makes use of the KPN network. And it is technically not possible. So we must wait till the provider makes sure this is possible.
I also was surprised that they never told me this in advance. Actually they didn't knew it was an problem till I called them.

Er, exactly what "is not possible"?
3G to 2G switching works fine on my other phone (an HSDPA-enabled Nokia 6120 Classic, on the same network).
So how can this not be handset related? I can see how it could be a combination of the phone and the network but if other handsets can cope then it must be related to the handset in some way.
Incidentally I am now using my replacement Vario III and so far so good but its early days yet.
mlh01 said:
This is correct, the problem is indeed not your Tytn II. I've called with a dutch provider (Telfort) which makes use of the KPN network. And it is technically not possible. So we must wait till the provider makes sure this is possible.
I also was surprised that they never told me this in advance. Actually they didn't knew it was an problem till I called them.
Click to expand...
Click to collapse

which ROM versions are experiencing this problem?

I get this in the UK on a Tuesday at around 16:00 and then all is ok after 17:00. If I turn off HSDPA then this does not happen at all.
My view is the T-Mobile network. Being as I know when it happens its not a problem but I think they have time slots for software upgrades etc to the HSDPA side of things and this is when your phone goes into a GSM lockout.
If I keep the phone on 2g then it never happens .
This also happened on my N95 on the same day at the same time also , so i would guess its a network thing

I had this occur again this morning, on the new handset. I tried to call home with a full set of bars and the phone in 3G - the call wouldn't go through.
Switched to 2G, call goes through.
The problem is that when you are in this mode there is no way to tell, without trying to make a call. Your phone is effectively useless as no-one can call or text you and you can't call out. You are blissfully unaware.
This is not an acceptable situation.
wardy said:
I get this in the UK on a Tuesday at around 16:00 and then all is ok after 17:00. If I turn off HSDPA then this does not happen at all.
My view is the T-Mobile network. Being as I know when it happens its not a problem but I think they have time slots for software upgrades etc to the HSDPA side of things and this is when your phone goes into a GSM lockout.
If I keep the phone on 2g then it never happens .
This also happened on my N95 on the same day at the same time also , so i would guess its a network thing
Click to expand...
Click to collapse

I have suddenly started to experience this problem on T-Mobile UK, starting last night. It finds a 3G network, but I cannot receive or send calls or SMS. If the network drops to 2G, I can generally receive texts, but it's only if I lower my band to GSM only that I can make or receive calls, or use data.
T-Mobile are generally crappy in my area anyway, my phone is forever flipping between 2 and 3G. Can anyone confirm what 3's coverage is like in south london (stockwell area if possible) and what sort of data/call packages you can get sim-only, as I fear that they may not work out as cheap as T-mobile's.

incidentally, I don't think it's an MDA vario problem as I'm running the TyTn II.

Lose signal and doesn't come back ?

Often times I have noticed with my Tilt that I will lose the signal (simply by hitting a dead spot in the service), and it will not come back until I do a soft reset. First, it shows the indicator that it is looking for a signal, but after about 10 seconds it switches to an indicator with an exclamation point, showing no signal. It never regains a signal after that. Once we get to a place where I know AT&T service works, I will check my wife's phone at that very moment, and she has full signal. We're both on AT&T btw. I know it's not the service, cause her phone never does this. If she hits a dead spot, as soon as we're out of it her phone picks service right back up. I have the stock AT&T ROM that shipped with my Tilt.
Anyone have any ideas why it quits looking for a signal after it loses it?

jackjohnson said:
Often times I have noticed with my Tilt that I will lose the signal (simply by hitting a dead spot in the service), and it will not come back until I do a soft reset. First, it shows the indicator that it is looking for a signal, but after about 10 seconds it switches to an indicator with an exclamation point, showing no signal. It never regains a signal after that. Once we get to a place where I know AT&T service works, I will check my wife's phone at that very moment, and she has full signal. We're both on AT&T btw. I know it's not the service, cause her phone never does this. If she hits a dead spot, as soon as we're out of it her phone picks service right back up. I have the stock AT&T ROM that shipped with my Tilt.
Anyone have any ideas why it quits looking for a signal after it loses it?
Click to expand...
Click to collapse
Ive noticed the same thing.
Not sure of why this happens, but did find an easier work-around than soft reset.
If you go into your phone options, under the Network tab, you can manually tell the phone to search for the network.

I've also had that problem.
I'm not sure wich fix is faster, but using the Wireless Manager to turn the phone off and then back on also takes care of the problem.

hey, i also have that problem.. i'm using a tilt with one of dutythroys roms, with the new .17 radio.. thought maybe that was the problem cuz i never really noticed it with the .11 radio. btw, you dont need to soft reset, just give it a minute or two and it'll come back
omar

I noticed that after messing with KaiserTweak and enabling HSDPA. I live in Minneapolis where HSDPA is now enabled. However, I frequently travel west towards Alexandria, and once I leave the metro area, no HSDPA. If I don't go into the comm manager and disable 3G, I have no phone service at all. Once I disable 3G, I regain phone service.

Ok good, so I'm not the only one.
Thanks for the tip about turning the phone on and off in wireless manager, rather than doing a soft reset. That is, indeed quicker. However, we shouldn't have to do that at all.
I've noticed this a lot when driving home from work. I'm thinking that it's probably because at work I'm in a 3G area, and on the way home I lose it. Is there anyway to disable 3G altogether? Or does anyone know of a tweak that will keep the phone continuously searching before it gives up?

I have that same problem with my TILT, but I also had it with the 5150. It's been around for a while.

Bump again. C'mon people - you gotta give us something. Is no one else having this problem?
For the record, I didn't have this problem with the stock HTC ROM on a different phone.

Having this problem sometimes on a T-Mobile Vario 3, although mine seems to not recognise the sim card after it looses signal. I had thought it related to the phone being cold...

I have the same problems but only with 3G on. When I select GSM only no problems at all. I updated to .17 and wonder whether that's the problem since I don't recall any issues with .11

Thank the lord I thought it was just me. I made a thread about my blue tooth causing it but I realized it is my drive home that does it. I hit an area with no 3G and it goes out.
I have the 10 button comm manager installed and was wondering if that was the culprit. It is weird because EDGE will switch to GSM OR GPRS (not sure the correct name) when 3G is off but 3G will not switch to the others. Does anyone without the 10 button wireless manager have this issue.

Had similiar issues while traveling in certain parts of southern China. Try upgrading the radio from ver. 1.27.12.11 to 1.27.12.17. Follow this link for more info...http://forum.xda-developers.com/showthread.php?t=349528

I am redoing the phone back to the stock condition of how it arrived. I will tell you if it goes back to normal for me.
I will update you tomorrow becuase it is a certain part of downtown Houston that cuases it to go out .

I put the original OS/ROM I am not sure what you call it. For the first time in a long time it switched from 3G to EDGE. I wonder how many of us complaining have the 3G ten button communication manager. I will let you all know more tomorrow after my drive home from work.
bigsherv said:
I am redoing the phone back to the stock condition of how it arrived. I will tell you if it goes back to normal for me.
I will update you tomorrow because it is a certain part of downtown Houston that causes it to go out .
Click to expand...
Click to collapse

Did you see this thread?
http://forum.xda-developers.com/showthread.php?t=344273

can everyone who has this problem start posting their Radio Versions ... please
I used to have this problem with the Tmobile SDA (at that time it was driving people nutts) and that phone did not even have 3G. I did experience the same problem with Tilt (on tmo sim) Radio Version .11, and since tmo usa does not have 3G anyways, I just changed my phone band to GSM and the problem does not exist anymore.

Radio 1.27.12.11
Protocol 22.45.88.07H
in German o2 and T-Mobile network, problem persists after repair trial of HTC.

So 24 hours after redoing the phone back to its original state the 3g problem is gone. I watched it switch from 3G to edge to G all in 24 hours. I will keep you posted if it stays this way.
So basically the big change I had was removing the 10 button comm manager.

I was having a problem that I think is similar, or the same. When I travel from Edge to G my phone will ring and it indicates "connected" but I can't hear the person and they can't hear me. I soft-reset and the phone works again, until I travel back from G to Edge. I ended up reflashing to the original HTC Shipped ROM and I am waiting to see the results.
I am not sure of my radio version when it was flaky. I am using 1.27.12.11 now.

I've noticed the problem described in the original post maybe three times since I bought my TyTN II late in September. It's always been when I'm travelling that this happens. Fortunately I've not missed any calls as a result and switching to 'Flight Mode' and back to 'Phone' in Comm Manager (the standard HTC version) works around it for me. All a very standard setup here so I don't think the problem is a result of any customisations (although I do have HSDPA enabled in settings).

Tilt: lost signal never recovers

Folks,
(I've searched around a bit and seen some reference to this problem but no definitive discussion. I apologize in advance if I missed anything and humbly request a pointer to the existing info if so.)
Just got a Tilt last weekend. On 3 occasions so far I looked at the screen and noticed that the phone had no signal (triangle with ! next to it). So for several hours each time, no one could call me. Going into comm mgr, the phone radio was still on.
This was in an area with no signal problems; soft reset or pulsing the phone radio in comm mgr would restore functionality with 3-4 bars. I finally nailed this down to having been in an area in the center of the building where I work, where signal gets lost. It appears that my Tilt never automatically recovers from a lost signal.
I saw this problem on the ROMs that came with the device and now it also continues with the new one that was just released by HTC a couple of days ago. In case it matters the phone is unlocked (using jump_spl and the other related tools and procedures found here, thanks).
Do I just have a defective Tilt? I mentioned this to others in my office and a few folks also claim to see this, and like I said I have seen *some* mention of this on the internet... I'd be astounded if this were really a problem endemic to all Tilts -- would people really put up with this?
Anyone have any additional insight?

It used to happen with me when I had the stock AT&T rom. I flashed the stock HTC rom and I don't recall ever having that problem, and now I've flashed SNE v2.5 and I don't have that problem.
My suggestion is to flash a new rom and see if that helps, and to make sure you're using a correct radio.

where do I get official htc radio and rom downloads?
hi folks,
where can i get official HTC radio and ROM downloads? I have an HTC TYTN II (acquired in Hong Kong) with ROM 1.56.721.3, Radio 1.27.12.11 & Protocol 22.45.88.07H just last month and already I'm encountering problems with the phone just losing the signal and staying lost and I'm considering upgrading however since my phone is brand new (practically), i want an "official" upgrade so as not to void the warranty. any help would be appreciated.
thanks and best regards...

I'll have to decide whether I have the cohones to flash an HTC ROM. Might at least be worth a try.

try this, go into comm manager, than settings for the phone (right soft key), than over to the Band tab, if I select the network type as GSM and leave the band on auto mine will contstantly serch for signal. i know this because my office is as close to a bomb shelter as they come and it never stops searching.
another good to this is battery life is improved
the BAD, if you want to use 3G you have to turn network back to auto and band to auto. not really a big deal cuz i dont have 3G here (yet).
a little workaround that works for me.

Thanks for that... I am running an AT&T ROM and even though I've supposedly turned on the Band tab in phone settings via KaiserTweak, I do not see a band tab. Should I?

I have almost this same exact problem! As of two weeks ago, my tilt started not allowing me to make calls
I then realized that it was also sending all my calls to voice mail. Thing is, the phone says that I have signal and has the Edge connection sign at the top. Whenever I try to make a call, the phone says "operation cannot be completed" or it will simply beep at me as if the call ended, right after it started.
A soft reset allows this to work. I've had this problem even happen right after hanging up with someone, and then trying to redial another number 5 seconds later. I doubt the phone really lost the signal.
Any ideas?

Hello
http://forum.xda-developers.com/showthread.php?t=367355
Thanks

I had the same problem with my O2 XDA Stellar, it was fine for a couple of months, then I could hardly call out on it, email wouldn't send, could rarely go online etc etc. It seemed to be better on GSM/GPRS than 3G, HSDPA etc. I assumed it was a harware problem & as it was under warranty I got a replacement from O2 & it's been fine so far.

AT&T replaced the SIM card in my phone and I believe this has fixed the problem. I have lost signal many times (elevators, garages, etc) and it recovers each time.

Sudden 3G Network Problem on a Kaiser

My TyTN II developed a strange problem during the last week. It’s all started one morning when I suddenly discovered that I can’t make a call. Every call that I tried to place ended by itself even before I hared a first deal tone. I’ve made a soft reset and the phone took unusually long to find a local network (Orange). I call the network operator and was told that in my area they don’t have any problems. After some more trials I’ve made a hard reset. Reinstalled my software and it seamed to work out. But about three days later the problem returned and in addition to it the TyTN eat up almost fully charged battery over night (just once, it didn't happen again).
I couldn’t place a call again, but this time a hard reset didn’t help. What helped is that I changed the network type from “Auto” to a GSM. That means that I have excluded 3G WCDMA service.
Now, at least during the last two days, the Kaiser phone is working, but without 3G. I visited the local technical center (they are not specialized in HTC phones) and they told me that they can’t see anything particular wrong with the phone, but they are not a specialized HTC service center. So, what’s wrong with it? During the last 3 months I had 3G services without a problem. Sending the phone to a specialized HTC center (abroad) may be costly and they also may not find anything wrong with it, because phone if set back to the Auto mode sometimes even finds the 3G network.
Did somebody have a similar problem? Please help. What it could be? Problem with the phone? May be the SIM? Or just the Orange service network got crazy?
I have an original ROM:
ver. 1.56.405.5 (08/28/07),
Radio 1.27.12.11,
Protocol 22.45.88.07H

Hi there,
I had exactly the same problem. I first thought it might be with my sim card but it worked fine on other phones.
I have since sent the phone to HTC and had it repaired -- works fine now.
Hope this helps.

I had the same problem on my Kaiser when it first arrived from an ebay sale. Worked fine in GSM/Edge mode, but would not make or receive calls in 3G mode at all. Finally sent it back to HTC in the US who repaired it at no cost (thanks guys!) and shipped it back to me.
It's been working fine since then.
I read lots of others who have had this problem and the fix seems to be returning to HTC for repair.
/drt

I had this problem and still have. I send my phone back 4 times. First time something went wrong. 2nd time it got a motherboard replacement (for the 3G chip) it work even better then when I bought. It lasted for 14 days untill the 3G failed again. I send it back got and Worked for 1 day again re-send it they called me said it's working fine with them (3G options) and they can't find any problems with it. I received the phone back. Worked for 1 day again on 3G then again the problem. I have checked with my provider no problem. Tried other sim cards issue is still there. I'm keeping it here till the Xperia gets out then I'm sending it back untill the 3G issue gets fixed.
No matter what issue this phone has, it's the best on the market imo, that's why I keep up with it.

Phone shows full service but I don't receive calls

Sometimes people call me and get a message saying my phone is off or out of service. But when I look at it, it often shows 4 bars of service..
When I call someone, the problem disappears temporarily, and I start receiving calls again (and I receive all the SMS's I was supposed to get at once), only to appear again later for no reason (a soft reset also solves it). It's not related to location, it also happens when I spend the day at home (where I get a strong signal).
I don't think it's a operator problem either, since my operator is known for it's good services, and other people who use "normal" phones never had such a problem.
I tried 3 different ROMs (dutty's hybrid, Hyperdragon and AthineOS) and 3 different radios (dutty's radio (1.65 something), hyperdragon's (1.70 something), and eMo radio). Right now I'm using AthineOS with hyperdragon III's radio, and almost no programs installed..
This problem happens both in 3G and EDGE mode.
Anything I can do about it?

Send it in for repair?
Seems you tried all you could...

Don't think I can send it for repair, since it's an AT&T Tilt and I'm not even in the US..
Guess I'm outta luck then
Anyone else have any ideas?

have you tried the sim in another handset, sounds like a network problem to me.

3G Network
Are you using 3G Network?
Sometime I use 3G band and even It show good signal I loose phone calls.
I changed to GSM and no phone calls loose.
This happens in São Paulo/Brazil but...
EDIT: Sorry. Now I saw that you reported this problem also using GSM band.
Thanks.

I am not sure if you're using your US SIM card in a foreign country?
Maybe you just forgot to enable INTERNATIONAL ROAMING before you left ... ?

I'm having the same problem
I seem to have started with the same problem about a week ago. A couple people complained that they called me but it rang twice and went to voicemail - My phone never rang. However, after I made a call (or apparently did something to "wakeup" the phone), I would get the voicemail notification (2 hours later).
I tried reseating the SIM card, but then it went to "SIM Card Missing". I did a hard reset, but that didn't help. I took it back to AT&T and they replaced the SIM Card. That seemed to work again, and certainly would have been a convenient fix (bad SIM card - too easy). So I've just spent all weekend reloading all the apps, but now it's happening again!!
The symptoms are; After I reboot the device, I can receive one or two calls, then it doesn't ring anymore (the caller hears 2 rings then it goes to voicemail). If I cycle the Phone radio button in the Comm Manager, or cycle power, it comes back to life for 1 call, then craps out again.
I'm just using the standard AT&T ROM (without the Bloatware after this past reset) and the standard/default radio version 1.27.12.11
The only thing that I have noticed that seems different lately is that the "Comm Manager" task is always running when I look at the running programs (which I don't think it used to) I had also recently installed Garmin XT.
The device is of course 1 yr + 2 weeks (so I assume just out of warranty)
Any help would be greatly appreciated!!!

Hmmm,
what I would try, is, to just make a hard reset, load only my contacts to the phone and run it for a while to monitor its "Incalling" behavior. If everything seems to be fine, I would go ahead and start installing an application, then monitor my device again for a while, if everything is fine I will go ahead install the next application ... and so on. That is just to make sure that no 3rd party application causes this problems.
BTW:
I don't think that GARMIN causes this problem. I used to run Garmin on my HTC too (v5.0) until I came accross SYGIC McGuider (which works much better and card scrolling is much smoother than Garmin).
Well,
to come back to the point: if you get the same problems without loading any 3rd party application on your device, then I would recommend trying another ROM (best advice: go with the HTC stock ROM). If it also happens with the other ROM then it might be hardware related and difficult to fix.

Thanks - I knew that's what I should do, I just didn't want to do it after having spent all weekend reloading and configuring it. I thought I had read somewhere about Garmin having to have the phone radio on to work, so I was hoping there was a setting somewhere that I was missing that was powering the radio down. But..... I suppose it's time to go back to common sense and just do the reset
So far it seems to be working now. I'll give it a few days with just the basics and then start reloading one at a time.
Thanks for the quick response!

Spoke too soon
looks like I spoke too soon, it's doing it again - seems like it was fine for about 3 hours, but now .....
guess it's time to try my luck with AT&T - time to see how good their customer service is

bbaydiver said:
looks like I spoke too soon, it's doing it again - seems like it was fine for about 3 hours, but now .....
guess it's time to try my luck with AT&T - time to see how good their customer service is
Click to expand...
Click to collapse
Well, I'm experiencig totally same stuff here. I don't know whats really going on. I've NEVER before had such or even simialr problem.
Ive installed stock HTC ROM. And its going again.
One question. Are you using Opera Mini maybe?

kristoff_sz said:
Well, I'm experiencig totally same stuff here. I don't know whats really going on. I've NEVER before had such or even simialr problem.
Ive installed stock HTC ROM. And its going again.
One question. Are you using Opera Mini maybe?
Click to expand...
Click to collapse
no, I was just using the default browser.
I've got nothing installed on it at this point so I'm guessing it's hardware related.
Over the last couple months I had been experiencing some strange battery drainage (not related to the GPS issues). I don't know if that was a symptom or not. It just seems like the radio is going to sleep somehow - it wakes up for a little while if I sync my email, cycle the radio via comm manager, or cycle the power.
Anyone know if there is a setting somewhere that controls that? (sure would be nice if it were that simple)
The AT&T store was basically useless, all they did was give me the phone number for the warranty department (but since I'm 2 weeks past warranty, he doesn't think they'll help me), and of course offer to upgrade me to the Fuze for $375 - no thanks!

I've had the same issue (I think). I too think that it seems to happen when I have a 3G data connection active and moving back to GPRS (non 3G) seems to make it better....
I'm on a standard UK ROM and using BTMobile as a provider.
I was driving down the motorway the other day and overtook a friend. He rang me and went straight to voicemail. I then got a text to say that I had a voicemail and rang him back.
I was running TomTom Traffic at the time so would have had a data session enabled....
I think its something to do with the data session sometimes not letting a call through but can't put my finger on anything and certainly can't find an option to change any settings...
Also, even at home, I'm constantly picking up my phone to see that it "has no signal" and the exclamation mark is displayed - so calls aren't coming through - but it then connects and shows a three-bar strength signal. Don't understand why it keeps dropping out, but I get a 3G connection at the front of my house and an ordinary G connection at the back and I think that it sometimes to stay connected to the 3G connection for data even when the phone signal is very poor and it would be better dropping that and connecting at "old" GPRS speed...
Same on the train on the west coast main line out of London. I think having the 3G turned on causes the phone signal to drop out completely more than when 3G is turned off, as the phone tries to hang on to the signal of a 3G cell and doesn't successfully switch over to the next "non 3G" cell whilst in a call.

have you tried a new radio such as NIKI's?

well, AT&T warranty was even less than useless. Home phone, Internet, and Wireless all through AT&T and the best they can do is "see if they could get me a deal on a new phone" or refer me to HTC technical support. Nice customer service AT&T!!!
HTC technical support was actually trying to be helpful, once she found out I already did a hard reset, she referred me to their warranty group. They looked up the S/N and it's still under their warranty (I guess theirs is 15 months after manufacture date). Now the only problem is I have to send it in to them to see if it's covered under warranty, and of course be willing to go without my phone for 2 weeks (and pay them a yet to be determined amount if they decide it's not under warranty).
I'd like to try a different radio, but looks like there's too much for me to read up on - I need to get the device fixed, I've already lost too much time with it being messed up and me screwing with it.

Update
so this morning I was ready to throw in the towel and send the device back to HTC. At least they were willing to help me out, unlike AT&T.
I get to work, and of course the phone seems to be working (which isn't unusual, it works for a little while then craps out). Come lunch time, it's still working (now this is unusual, it must be a fluke, I'll give a couple more hours before I package it up). 4:00 and it's still working! Now I'm starting to wonder if it's got to do with the cell towers near my house (and the AT&T store since it did it for them too).
I email my buddy who lives about 1/2 mile away and also has a Tilt just to see if he's had any similar problems. He calls me back laughing. There's 5 People in his office with the exact same problem (and not all Tilts either).
So to make a short story long....... it appears to be a problem with AT&T, NOT the device (but Thank You very much AT&T for the incredible customer care you demonstrated and for trying to screw me into buying new devices for outrageous prices)
So at this point, I'm not sure if it's that AT&T has fixed the issue across the board, or if it was the "Resync the routing" that the online chat person tried last night that finally propagated across the network (I assume so that AT&T can find my phone in order to route the calls to me).
I guess we'll see if it does the same thing when I get back closer to home tonight, but I'm relieved that it appears to be fixed.
Thanks everyone for the suggestions! Now I have a little more time to read about how I can screw up my phone on my own schedule - all the practice of resetting it and reinstalling everything, and seeing how much faster it is has inspired me

Hi bbaydiver
Did Att fix your problem? I had same issue with my tilt 8925. I tried all the orginal Att rom "same problem". After couple minute, I can't receive and make call. thanks

kwong1998 said:
Hi bbaydiver
Did Att fix your problem? I had same issue with my tilt 8925. I tried all the orginal Att rom "same problem". After couple minute, I can't receive and make call. thanks
Click to expand...
Click to collapse
Have you tied asking AT$T for a new sim card ? They do wear out you know.

denco7 said:
Have you tied asking AT$T for a new sim card ? They do wear out you know.
Click to expand...
Click to collapse
I didn't tried asking AT&T for a new sim card. but I will call them to change the sim card. Does anybody know how to disable the 3G function?

Just a "me too..."
Hello everyone. I just wanted to report that I'm having the same issues...they started about a week or so ago.
I've had my AT&T Tilt for about 8 months now (it's a warranty replacement for my first tilt, bought in July...so of course, I'm out of warranty). I recently had problems receiving calls, and then I started being unable to make calls, even though my phone shows a decent signal...anywhere from 4 bars to 2 bars. When dialing, it'll say "Dialing..." for a few seconds...and then it clicks off. A soft reset will fix things temporarily, but that's it.
I'm running the stock AT&T ROM (I'll check the version number if someone thinks it'll help), and I've tried doing a hard reset AND replacing the SIM card. Same effect.
Someone please let me know if they resolved this problem. AT&T offered me an HTC Fuze...but I'm extremely wary of other phones by this manufacturer. I'm very, VERY tired of phones crapping out on me after having just spend a couple of hundred bucks on them. At this point, I'm just looking for something reliable. If someone else here has had problems with the Fuze, please let me know...not to start any fights around here, but I'm actually thinking about going with the iPhone.
Thanks.